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Context: The association between thyroid hormones within the euthyroid range and metabolic syndrome is not clear.

Aim: This study evaluated the relationship between thyroid hormones and metabolic syndrome and its components in euthyroid subjects.

Design and setting: This is a cross-sectional population based study conducted within the framework of the cohort of the Tehran Thyroid Study.

Participants: Out of 5786 subjects aged ≥20 years, 3755 euthyroid subjects without a history of thyroid disorders, diabetes, or use of steroids or lipid-lowering agents were investigated.

Outcome measures: Body weight, waist circumference (WC), and blood pressure (BP) were measured. Serum concentrations of lipids and lipoproteins, fasting blood glucose (FBG), insulin, free T₄ (FT₄), and thyrotropin (TSH) were assayed. Metabolic syndrome was determined by definition of the Joint Interim Statement adjusted for the …